Improvement in harrows



"M. .McNITT.

. I Harrows. v

NO-1559037. v v Patented Sept.'15,1874.

THE GRAPHIC C0 PHOTD-L|TH.39& 4-! PARK PLAcE,N.Y.

mamas.

UNITED STATES PATENT OFFICE..

MARTIN MGNITT, OF MOUND STATION, ILLINOIS.

IMPROVEMENT IN HARROWS.

Specification forming part of Letters Patent No. 1 55,037, dated September 15, 1874; application filed May 16, 1874.

Similar letters of reference indicate corre-.

sponding parts.

The invention is an improvement in a wellknown class of harrows whose teeth are set in oscillating bar.

The improvement relates to the construction and arrangement of parts whereby the teeth of the rear bar of the series are adapted to assume an angle or position different from the teeth of the other bars, as hereinafter described.

In the drawing, A A indicate the side bars of the barrow-frame, which are beveled at the front end and connected by a cross-bar, B. The bail P and straps 0 form a draft attachment. A bar, L, is hinged to each of bars A, and the two are secured together at the other or rear end, and supported by a caster-wheel, M. The drivers seat N is also located at that point. The bars 0 G are provided with teeth D D, respectively, and journaled equidistantly in the side bars-A A. Ahand-lever, H, is attached to the rear bar, 0, and connected with the bars 0 by means of bar G, links I, and bar E. The latter slides in a keeper, F, fixed on the front bar, B, being arranged at right angles to the toothed bars. Said bar E has notches J in its upper side or edge, in which the pawl K engages when suitably adjusted therefor. The pawl K is pivoted to the lever H at its angle, as shown.

By this construction and arrangement of toothed bars, lever, and connecting devices, the teeth of the rear bar 0 move through a less number of degrees than those of bars 0, which all move in unison. The result is that the teeth D of bar 0 may be set at different angles, and hence be brought into action even when the others are out of action altogether. Thus not only may the soil be acted on differently by reason of the teeth being set at different angles, but the rear teeth, D, may be used to operate alone, as is frequently requisite on old or well-pulverized soil.

When the lever H is thrown back, as shown in the drawing, the teeth of the several bars stand nearly vertical together; but when the lever is thrown forward the teeth D of bar 0 assume such an angle that they still project below the side bars A A, while the teeth D of bars 0 do not.

What I claim is- The combination of lever H, toothed bars 0 0, bar G, links I, notched and sliding bar E, and pawl K, as shown and described, whereby the teeth D may be employed singly,'as set forth.

MARTIN MCNITT. 

